I have a portable washer from which I drain water (from its hose) into a bucket and then must lift the bucket (from off the floor) to pour the water into kitchen sink. This bucket-lifting is getting too hard for me. Is there a pump out there to pump water from a 5-gallon bucket into a kitchen sink?
For a similar task I use a "Table Top Fountain" pump. They are submersible and can hoist the water for that distance. Read the specs, esp. GPH (Gallons per Hour) so you know what the drain rate is for the height required, but generally for a bucket even the smallest pump is fine.
Attach a hose long enough, drop the pump into the bucket, put the other hose end in the sink, plug it in, and listen to the hum and watch it empty.
It's okay if the pump runs dry for a brief moment at the end of the pumping, and of course the little rest at the bottom can be emptied by lifting and tipping the bucket into the sink as before.
A tiny pump, at 80 GPH, will empty the bucket in under 4 minutes.
But I would get a pump that's a little larger so that it takes less time to lift 36 inches to counter height.